Dhizaini yePCB yeMaikorofoni: Magadzirirwo Anoitwa Bhodhi Rako Pacharo muKunzwa Kwako

PaPCB yemakrofoni , chikamu chinotariswa nemunhu wese i sensor — asi bhodhi rakaipoteredza rinoita hafu yebasa. Nzira inotorwa nechiratidzo, uko mvura inoyerera pasi, kuti ruzha runosvika sei pa diaphragm, uye kuti chikamu chacho chakagadzirwa zvakachena sei zvese zvinosarudza kana uchitora kutaura kwakajeka kana kurekodha kwakazara nekurira, kusina chinhu. Gwaro iri rinobata bhodhi remakrofoni sesisitimu yemagetsi, kwete kungotevedzera tsoka chete, uye rinofamba nepakati pesarudzo dzinoparadzanisa dhizaini yakanyarara, inonzwisisika kubva kune ine ruzha. Zvinhu zvakafanana zvinoshanda kunyangwe wakatsvaga mic PCB yemakrofoni, bhodhi remakrofoni, bhodhi remagetsi remakrofoni, PCB yemakrofoni yeMEMS, kana bhodhi remakrofoni re electret — zvese zvinosvika ku sensor, port, uye grounding.

Zvinotevera ndizvo zvinotariswa nemainjiniya edu ekugadzira maacoustics kuHighleap Electronics panguva iyo maikorofoni inoonekwa pabhiri rezvinhu — bhodhi risati ragadzirwa uye risati ratanga kudzokororwa.

1. Chii chinonzi Microphone PCB uye Nei Bhodhi Iri Chikamu ChemaAcoustics

PCB yemakrofoni ibhodhi redunhu rinobata sensor yemakrofoni uye rinoendesa kubuda kwayo — pamwe nechero bias, filtering, uye ground reference — kune codec, microcontroller, kana amplifier. Mumagadzirirwo emazuva ano, maikorofoni inowanzova chikamu chekuisa pamusoro, saka bhodhi harisi kungotakura chete: rinoumba chikamu chenzira yeacoustic uye reference yemagetsi iyo sensor inoenderana nayo.

Izvi zvinonyanya kuoneka nemamaikorofoni eMEMS ari pasi pechiteshi, uko ruzha rusingapindi nepakati pechinhu zvachose. Runopinda nepaburi rakaboorwa muPCB pasi pesensor. Kana zvakadaro, dhayamita yegomba rebhodhi, plating, uye chisimbiso chiri pakati pemaikorofoni nebhodhi zvinoumba acoustic design parameters chaiyo se diaphragm pachayo.

Cheni yechiratidzo pabhodhi remamaikorofoni rakajairika

Kune maikorofoni yeanalog, cheni yacho i sensor → bias network → high-impedance trace → codec kana pre-amp input. Kune maikorofoni yedhijitari, sensor inobatanidza amplifier uye analog-to-digital converter, zvichiburitsa PDM kana I2S stream inotungamirwa newachi. Chero nzira, bhodhi rinofanira kuchengetedza chiratidzo chidiki, chine high-impedance, uye chinogona kukanganiswa nyore nyore kubva kumasekete edhijitari ane ruzha uye esimba achigovana PCB imwechete.

Chikonzero nei bhodhi richisarudza mhando yeruzha

Mabhodhi maviri akavakwa nechikamu chimwe chete chemaikorofoni anogona kurira zvakasiyana zvachose. Ruzha rwepasi, ripple coupling inoiswa mumutsara webias, acoustic port isina kuvharwa zvakanaka, kana gomba reruzha risina saizi yakakodzera zvinoderedza kurekodha. Sensor inoisa denga pahunhu; bhodhi ndiyo inosarudza kuti wasvika padenga rakadii.

2. MEMS vs Electret, Analog vs Digital: Kusarudza Sensor

Sarudzo yekutanga pane chero PCB yemakrofoni inyanzvi yekuona uye fomati yayo yekuburitsa. Sarudzo idzi dzinoenderana nehurongwa hwese, saka dzinofanira kutanga pakugadzira, kwete pakupera.

MEMS inopesana ne electret condenser (ECM)

Maikorofoni yeMEMS isilicon micro-electro-mechanical sensor iri mupakeji diki ine amplifier yakavakirwa mukati. Inochinjika-inosanganiswa, inogara ichichinjika chikamu nechikamu, yakadzikama pamusoro pekupisa, uye diki - ndosaka ichinyanya kushandiswa pamafoni, malaptop, maearbud, uye akawanda magadzirirwo matsva. Maikorofoni ye electret condenser (ECM) inoshandisa diaphragm yepolymer yakachajwa uye JFET; haina mutengo wakaderera uye inogona kunzwika zvakanaka, asi kazhinji igaba rine maburi kana waya rakasungirirwa nemaoko kana rakamiswa zvakasiyana nekuti element ye electret inogona kukuvara nekupisa kwe reflow.

Kubuda kweanalog nedhijitari

Maikorofoni yeanalog inoburitsa voltage diki inofanira kuendeswa kucodec nekungwarira uye inogona kukanganiswa neruzha munzira. Maikorofoni yedhijitari inoshandura ruzha kuita mabhiti ari mukati mepakeji, saka PDM kana I2S output yayo yakasimba zvikuru kana iri kure uye haipindi ruzha rwebhodhi - zvichireva kuti inoda wachi uye digital routing. Kune multi-mic arrays uye long internal traces, digital inowanzo hwina; kune madhizaini mapfupi uye ari nyore e single-mic, analog inogona kuva nzira inodhura zvishoma.

Kuverenga nhamba dzepepa redata

Zvinhu zviviri zvinotungamira sarudzo mukati me tekinoroji. Chiyero cheSignal-to-noise (SNR) , chakapihwa mu dB(A), chinokuudza kuti pasi peruzha remaikorofoni rakanyarara sei - chikamu che65 dB(A) chakachena zvinonzwika kupfuura che58 dB(A) kune masosi ari kure kana akanyarara. Kunzwa (mu dBV/Pa yeanalog, dBFS yedhijitari) kunoisa mwero wekubuda uye kunobatsira kuenzanisa kukwira kwenzwi pasi. Acoustic overload point (AOP) inokosha kune nharaunda dzine ruzha. Sarudza SNR kuti ijekese, kunzwa kwemazinga, uye AOP yeheadroom.

3. Dhizaini yeAcoustic Port: Top-Port, Bottom-Port, uye Sealing

Kuti ruzha runosvika sei padiaphragm ndicho chikamu chekugadzirwa kwePCB yemakrofoni kazhinji kacho haruna kukosha. Kana ukanyatsoongorora chiteshi, kunyange ruzha rwepamusoro-soro rwesensor rwuri kunzwika zvisina kujeka, ruchinzwika zvine ruzha, kana kuti rune ruzha.

Chiteshi chepamusoro chinopesana nechiteshi chepasi

Maikorofoni yepoteri yepamusoro ine nzvimbo yayo yekubuditsa ruzha pamusoro pepakeji, saka bhodhi riri pasi rakasimba uye gomba rinogara muburi rechigadzirwa panzvimbo pacho. Maikorofoni yepoteri yepasi inotora ruzha nepaburi riri pachigadziko chayo, zvinoreva kuti PCB inofanira kunge iine gomba rinoenderana neburi riri pasi pesensor, rakanangana nekuvhurwa kweacoustic kweburi repoteri. Magadzirirwo epoteri yepasi akajairika nekuti anorega nzira yekubuditsa ruzha ichipfuura nepabhodhi zvakanaka ichipinda mudura remudziyo, asi anoita kuti PCB ive chikamu cheacoustic.

Kuyera uye kupedzisa gomba reruzha rePCB

Buri reruzha rinowanzo bhoorwa diki riri pakati pe 0.25–0.5 mm, rinochengetwa risina mamasiki e solder uye rakaiswa mukati mehuremu hwakatarwa nemugadziri. Mapedhi akaripoteredza ane rin'i yakavharwa saka solder paste inogadzira gasket risingapindi mhepo pakati pemaikorofoni nebhodhi - kana paste ikabatanidza gomba kana chisimbiso chikadonha, makamuri ekumberi neekumashure anopfupika pamwe chete uye SNR inodonha. Buri rinowanzo siyiwa risina purasitiki kana kuti rakaiswa pasi pechitsiko chemutengesi wemamaikorofoni kudzivirira kuchinja dhayamita yaro inoshanda.

Kuchengetedza chiteshi chiri mugungano

Nekuti chiteshi chinofanira kugara chakavhurika uye chakachena, maPCB emamaikorofoni anowanzoda nzira isina kuchena kana firimu rekudzivirira panguva yekusuka, pamwe nekungwarira kubata kuitira kuti flux, guruva, kana conformal coating zvisapinde mugomba. Ichi chisarudzo chekugadzira pamwe nekugadzira, uye chinofanira kubvumirana nemugadziri wako usati wagadzira.

4. Kurongeka, Kudzika, uye Kubvisa Ruzha paBhodhi reMaikorofoni Rakachena

Kana sensor neport zvagadziriswa, marongerwo acho anosarudza kuti ruzha rwakawanda sei rwunosvika pachiratidzo. Mitemo mishoma inorangwa ndiyo inobatsira zvikuru.

• Chengetedza ma "analog maikorofoni" ari pedyo uye akananga kuenda kucodec, kure nekuchinjana kwezvinodzora, wachi, uye antennas.
• Ipa gwara rekutarisa pasi rakanyarara uye rinoenderera mberi pasi pemaikorofoni nezvinhu zvayo zvinokanganisa; dzivisa kupatsanura pasi pasi penzira yechiratidzo.
• Bvisa zvinhu zviripo Pamaikorofoni, capacitor inokurudzirwa nemutengesi yakaiswa pedyo nepini yemagetsi kuti irege kukanganiswa.
• Dzorera wachi yedhijitari yePDM/I2S nedata seboka rakafanana, rakachengetedzwa, uye chengeta wachi iyoyo kure nechero maikorofoni yeanalog iri muchimiro chimwe chete.
• Isa maikorofoni kure nekupisa uye kushushikana kwemagetsi — simba rekuchinjika kwebhodhi uye simba rekubatanidza zvinogona kubatanidzwa musensor.
• Muma "multi-mic arrays", enzanisa urefu hwetrace uye chengetedza geometry yechiteshi yakafanana kuitira kuti beamforming uye noise cancelation zviite sezvinotarisirwa.

Highleap painoongorora dhizaini yemakrofoni sechikamu chePCB yeaudio , tinotarisa pasi pemakrofoni, nzvimbo yekupatsanura, uye — kune zvikamu zvepasi peport — gomba reruzha uye chisimbiso padhirowa yekugadzira usati wagadzira chero chinhu. Kubata chiteshi chisina kuchengetwa kana chiteshi chakasvibiswa nemasiki panguva ino hazvidhuri; kuiwana mushure mechinhu chekutanga chakazara nekurira kunodhura zvakanyanya.

5. Zvikanganiso zvePCB zveMaikorofoni Zvakajairika uye Zvimwe Zviri Nani

Matambudziko mazhinji ePCB emamaikorofoni anogona kufanotaurwa uye anogona kudzivirirwa. Aya ndiwo anodzokororwa atinoona pamagadzirirwo anouya.

• Kukanganwa gomba reruzha rePCB riri pamaikorofoni iri pasi. Bhodhi rakagadzirwa rakasimba uye chikamu chacho hachina kunzwa zvakanaka — kukanganisa kwe respin kunoitika chete mushure mekubatanidzwa.
• Kurega chifukidzo chesolder kana kuti paste zvichisvibisa chiteshi. Kukwenya kwemasiki kunotetepa gomba uye kunama kunogona kurivhara; zvese zvinouraya mhinduro. Tsanangura nzira yakachena yekuchengetedza.
• Kudzoreredza chinhu che electret. Madiaphragm eECM anogona kurasikirwa nechaji kana achinge adziya zvakare — shandisa chikamu cheMEMS cheSMT, kana kumisa electret yoga.
• Ndiri kushandisa maikorofoni refu yeanalog padivi peswitcher. Mhedzisiro yacho inonzwika kuchema; chinja kuenda kumaikorofoni edhijitari kana kuti chinja nzira wobva wavhara.
• Kutsemura pasi pasi pemaikorofoni. Kuputsika kwereferensi kunowedzera ruzha; ramba uchidurura nguva dzose.
• Kugeza chikamu cheacoustic chisina kuchena nehasha. Mvura uye zvasara muchiteshi zvinosvibisa SNR; bvumiranai nezvekuchenesa kwacho pachine nguva.

Nzira iri nani ndeyekukiya zvinhu zvitatu usati waisa marongerwo: tekinoroji ye sensor (MEMS yeSMT, ECM chete kana yaiswa nemaoko), fomati yekubuda (yedhijitari ye arrays uye nzira refu), uye dhizaini ye port (iyo inosarudza kana PCB ichida gomba reruzha uye seal). Sarudza izvozvo, ipa mugadziri wako footprint yemutengesi wemakrofoni uye zvinodiwa ne acoustic, uye zvimwe zvese zvedhizaini zvinotevera zvakanaka.

6. Kwakakundwa kana Kurasika Mabhodhi eMaikorofoni: Kuboorera, Mask, uye Chisimbiso

Bhodhi remamaikorofoni harina kujairika nekuti chinhu charo chinonyanya kukosha - acoustic port - inogadzirwa panguva yekugadzira uye inodzivirirwa panguva yekuunganidza, saka matanho maviri aya haagone kugadziriswa zvakasiyana. Mugadziri anoboora gomba repasi anofanirawo kuchengetedza solder-mask ichiipoteredza, uye muunganidzi anoisa chikamu cheMEMS anofanira kugadzira solder seal isingapindi mhepo uye kuchengetedza flux uye kushambidza kubva mugomba. Kupatsanura izvozvo pakati pevatengesi vaviri uye musono ndipo chaipo panopera SNR chinyararire.

Highleap drills uye mask-inodzora gomba reruzha uye inomhanyisa fine-pitch SMT assembly pamutsetse mumwe chete, ichishandisa nzira isina kuchena kana yakachengetedzwa neport uye maitiro akafanana neanotiita kuti tive neruzha rwakaderera paaudio amplifier assembly . Tumira zvinodiwa nemutengesi wemakrofoni uye acoustic uye tichasimbisa port, kuchengetedza, uye kusimbisa bhodhi rekutanga risati ravakwa.

Tora Mutengo wePCB yeMaikorofoni Yako

7. Mibvunzo Inowanzo Bvunzwa

Ko maikorofoni PCB inoda gomba mubhodhi here?

Kungoshandiswa chete nemamaikorofoni epazasi, uko ruzha runopinda nepazasi pechikamu chacho. Izvozvo zvinoda gomba diki riri muPCB pasi pesensor, rakanangana nepaburi remukati uye rakakomberedzwa neringi repad rakavharirwa. Maikorofoni epazasi anotora ruzha kuburikidza nepakeji, saka bhodhi riri pasi pawo rinoramba rakasimba.

MEMS kana electret — ndeipi iri nani kune chigadzirwa changu?

MEMS ndiyo inowanzo shandiswa pakugadzira zvinhu zvitsva: inoiswa pamusoro pechinhu, inoenderana nekuchinja kwemvura, inogara yakadaro, uye iri diki. Maikorofoni e electret condenser anoramba achiyevedza kana mutengo wakakosha uye chikamu chacho chinogona kugadzikiswa nemaoko pane kuchinjirwazve mvura, sezvo kupisa kwekuchinja kwemvura kunogona kukuvadza chinhu che electret.

Ndeupi musiyano uripo pakati pemamaikorofoni eanalog needhijitari (PDM/I2S)?

Maikorofoni yeanalog inoburitsa voltage diki inonzwa ruzha rwebhodhi riri padyo netrace yayo. Maikorofoni yedhijitari inoshandura ruzha kuita PDM kana I2S bitstream iri mukati mepakeji, zvichiita kuti ive yakasimba zvakanyanya kana iri kure uye ive sarudzo iri nani yemakrofoni arrays uye nzira refu dzemukati.

Sei maikorofoni yangu ichinzwika isina ruzha kana kuti isina ruzha?

Zvikonzero zvinonyanya kuitika ichiteshi cheacoustic chakavharika, chisina kukura zvakanaka, kana chisina kuvharwa zvakanaka, uye ruzha rwemagetsi ruchibatana mumutsara wechiratidzo cheanalog. Pabhodhi remaikorofoni, matambudziko enzwi anowanzo dzokera kuchiteshi cheport, reference yepasi, kana kupatsanurwa kwemagetsi pane sensor pachayo.

Ndeipi SNR yandinofanira kutsvaga mumaikorofoni yeMEMS?

Kuti zvive nyore kutaura uye kushandiswa kwakajairika, 64–65 dB(A) zvichikwira ndiyo chinangwa chakanaka; magadzirirwo epamusoro-soro uye ekure anoshandisa zvikamu zviri pamusoro pe70 dB(A). SNR yepamusoro zvinoreva pasi rinozviitira ruzha rwakaderera, iro rinonyanya kukosha kune nhare dzakanyarara kana dziri kure.

MaPCB emamaikorofoni anogona kugezwa mushure mekuungana here?

Vanogona, asi nzvimbo yekubatidza inzwi inofanira kuchengetedzwa. Mabhodhi mazhinji emamaikorofoni anoshandisa nzira isina kuchena kana firimu rekudzivirira panguva yekuchenesa saka mvura netsvina hazvipindi mupaipi. Maitiro ekuchenesa anofanira kubvumirana nemuunganidzi wako usati wagadzira.